/*
 * Copyright 2013 Sigurd Randoll.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package de.digiway.rapidbreeze.client.infrastructure;

import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;

/**
 * Factory class to provide singleton {@linkplain Executor} instances of
 * different types.
 *
 * @author Sigurd
 */
public class ThreadPoolService {

    private static Executor threadPool = Executors.newCachedThreadPool();
    private static Executor queuedPool = Executors.newSingleThreadExecutor();
    private static ScheduledExecutorService scheduledPool = Executors.newScheduledThreadPool(2);

    /**
     * Returns a regular ThreadPool {@linkplain Executor} instance which
     * provides slots for executing {@linkplain Runnable} instances at the same
     * time.
     *
     * @return
     */
    public static Executor getThreadPool() {
        return threadPool;
    }

    /**
     * Returns a {@linkplain ScheduledExecutorService} which can be used to
     * schedule the execution of {@linkplain Runnable} instances.
     *
     * @return
     */
    public static ScheduledExecutorService getScheduledPool() {
        return scheduledPool;
    }

    /**
     * Returns a {@linkplain Executor} instance which executes
     * {@linkplain Runnable} instances one by one in a queue.
     *
     * @return
     */
    public static Executor getQueuedPool() {
        return queuedPool;
    }
}
